The printing method will effect the reflective effect for the soft reflectors.
The reflective vinyl material for silver color, is in weak transparent. you can see through the printing like below photo.
When we design a soft reflector, we must think about how to print it in best way.
For silk printing, the ink will cover 100% on the reflective material. it brings no reflective effect any more.
While for the offsest printing, the ink layer is very thin, so the light still can go through the material.
For EN13356 designs, the area without printing should be more than 15cm2, normally, we leave 20cm2 at least.
Below photos shows the silk printing ink covers the reflective material.
below photo shows the offset printing will still have reflective effect. not so much but still works
but of course, even whith CMYK offset printing on the surface, the reflector will not pass the EN13356 testing. because the ink effets the reflection a lot.
if you need colored reflectors, you can put the colored pvc under the silver reflective foil.